# GRDF Pros du gaz vs Effy Pro

The clearest difference is review sentiment: GRDF Pros du gaz at 80% against Effy Pro's 50%. GRDF Pros du gaz also leads on iOS requirement (11.0 vs 15.0). Effy Pro's advantage is update cadence (weekly vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GRDF Pros du gaz ships an update every 2 months, Effy Pro weekly. Both last shipped on November 2, 2026.

## The numbers

| Metric | GRDF Pros du gaz | Effy Pro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **80.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | Free |
| Size | 26 MB | 61 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GRDF](https://appshunter.io/developer/659519209) | [Quelle Energie](https://appshunter.io/developer/588695232) |

## What reviewers say

### GRDF Pros du gaz

[App page](https://appshunter.io/ios/app/grdf-pros-du-gaz/id1440042196)

Access essential GRDF tools for natural gas installation professionals on your smartphone. Includes network maps, pricing, connection simulators, technical regulations, and direct contact options for GRDF services.

**Highlights:** GRDF gas network map, Energy and connection pricing, Customer aid and savings simulators, Connection process and requests, Technical and regulatory answers, Gas outage information, Direct GRDF contact options

**Features:** macOS Compatibility

**In-app purchases:** none


### Effy Pro

[App page](https://appshunter.io/ios/app/effy-pro/id1454493946)

This app assists energy renovation professionals in offering their clients the Effy Prime. It allows for quick prime amount simulations and client prime request validation before quote signing, helping to secure more projects and grow business.

**Highlights:** Offer Effy Prime to clients, Simulate prime amounts, Validate client prime requests, Secure more renovation projects, Develop business activity

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GRDF Pros du gaz free?

GRDF Pros du gaz is free to download, with no in-app purchases.

### Is Effy Pro free?

Effy Pro is free to download, with no in-app purchases.

### Do GRDF Pros du gaz or Effy Pro have ads?

Neither GRDF Pros du gaz nor Effy Pro shows ads.

### Which is updated more often, GRDF Pros du gaz or Effy Pro?

GRDF Pros du gaz ships an update every 2 months, and Effy Pro weekly. Most recently, GRDF Pros du gaz was updated on November 2, 2026 and Effy Pro on November 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*